Locking means for sliding doors



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LOCKING MEANS FOR SLIDING DOORS Filed sept. 2o, 192e y2 sheets-sheet 1` Jan. 27, 1931. H Wl SHONNARD 1,789,989

LOCKING' MEANS FOR SLIDING DOORS Filed Sep'- 20, 1926 2. Sheets-Sham `2 Patented Jan. 27, 1931 UNITED STATE-SPATENT Olfluce HAROLD W. SHONNAED, OEMONTCLAIE, NEW JERSEY, AssrGNoR 'ro ELEVATOE sur!` Y PLrEs COMPANY, A CORPORATION or NEW JERSEY LOOKING MEANS non sLInING DOORS Application filed September 20,1926. Serial No. 136,454.

It is common practice, in connection with the operation of eleva-tors 1n hotels, o'flices and other public buildings, to provide power operated means for opening and closing the doors at the various floors on each elevator shaft.

It is important from the point of view of public safety that each door on every elevator shaft should be securely locked, save when the elevator cage is opposite such door.l The present invention relates to an improved means whereby each door may be kept locked, while at the same time permitting it to be automatically or manually unlocked when the elevator cage is in a safe position opposite the door opening.

The invention is shown in a preferred form in the accompanying drawings,wherein Figure l is a view of the sliding doors in eleva-r tion, provided with my present improvement, Figure 2 is a top plan view of the power operated movable locking stop, and Figure 3 is a side View of the same, partly in vertical section.

In Figure 1, the two parallel sliding floor doors, commonly used in the elevator practice are shown respectively at 10 and 11. The parallel dotted lines 12 represent the limits of a portion cut out of the door 11, and its operating toggle bar, to permit its inclusion within the sheet of drawing.

The doors 10 and 11 are operated, either through power mechanism or manually, in a Well known manner, by the system of toggle arms shown. The arm 13 is mounted to turn upon the xed pivot 14 at one extremity of the arm, while the other extremity of 13 is pivotally attached at 15 to one end of the arm 16.

The arm 16 is revolubly mounted between its ends on the door 10 on the pivot 17. The toggle arm 18 is pivotally connected with the arm 16 at 19, and its opposite extremity is pivotally connected with the sliding door 11 at 20.

At 21 is shown a handle attached to the arm 16. By drawing down on this handle, the toggle arms 13, 16 and 18 are so moved as to cause the two doors 10 and 11 to slide to the left in Figure 1, to open the door on a is introduced through the given floor in a well known manner. Mani ual operation of the doors in this manner will usually be unnecessary, as normal opening andclosmg of the doors 1s accomplished vthrough the power operated mechanism;

For this purpose, I have shown a well known'type of pneumatic engine, comprising a cylinder 22, within which operates a piston attached pivotally to one of the toggle arms,

13, by the connecting rod 23. The com-fv pressed air, or equivalent pressure producer, inletpipe 42 as is well known in this art. v

In order to lock the doors, preventing unauthorizedopening of the same I provide two abutments or stops, one carried by one of the doors, preferably the door 10, and the other supported by a fixture on the floor itself.

These are so placed as to come into contact when an attempt is made to open the locke-d door, but are so 4constructed as to permit unlocking of the door incither of two ways, viz.either through power operated mechanism when normal power operation of the door takes place, or manually when, for any resisting the pressure of the abutment or lever 24 when it is attempted to open the doors.

In order to permit manual unlocking, so that the doors may be opened by hand, the pivoted lever 24 is pivotally connected with an operating rod 29, the other end of which is pivotally connected with a bell crank 30, preferably mounted on the p-ivot 17 which supports the toggle arm 16. l

A thumb lever 31 is pivotally supported on the arm 16 close to the handle 21, and is connected with the opposite end of the bell crank 30 by the rod 32, whose opposite extremities .are ,pivotally connectedv with the' thumb piece 31 and the bell crank 30, respectively.

It will thus be seen that, if it be desired to open the doors by hand, without moving the abutment 25, the operator, as he grasps the handlel, presses. with his thumbnn the lever 31,."causingathebell crank.' 30v to .tilt clockwise and lifting the end of the lever abutment 25 so that its path of movement is above and fout of Contact. withiithe abutment 25.

l- The preferred construction whereby automatic unlocking of the doors vthrough the power mechanism is accomplished when they are normally opened by the engine 22 is -shown in Figures 2 and In Figure3, this is shownin the unlocked position. Y

. The lever 25,. pivotallysupportedonfthe shaft or pivot 28, is normally tilted `upward' into the locking position shown in Figurel by the spring 33, mounted upon the casting 34. The stop 35 prevent-sthe lever 25 .from tilting anti-clockwisevbeyondztlie locking position.

. The upper' portion 'of thecasting 34 is hollowed out to torina :chamber 36, normally.

main :supply pipe 42 which conveys com pressed air or itsequivalent' to the doory op.

erating engine 22.` `-.T he abutment lever 25 has i a tail-piece 43 whichL .abuts against the, ball 38 (See Fig..3).

When air or other fluid pressure Vis ad- 2. In'coinbination with a v'door.,#-t0ggle mechanism for moving said door, an operating handle on one of the arms of the toggle,

La movabletabutment on '..theldoonQa power' controlled. .abutment :upon fixed support, said abutments being in line, a lever on the arm near-'the handle, and means controlled by said lever for moving the door abutment out of line "with 'thepower Yabutment when the power mechanism: fails...

3. The combinationaccording to claim'l, i wherein meansaare included. fory normally. retaining the power abutment in line with.

the door abutment. D

prises a spring-pressed .lever andzal piston.

for moving said lever.

5. The coinbination according tov claim l,

further including.' toggle.,mechanism for moving the door, an operating handle fon .one

of the arms of the Ytoggl e,'and means adja cent said handle Vtor moving .said lmovable L abutment which is normallyfheld stationary,

out of line with the 'powerabutment fwhen.

the power mechanisinfails..

In testimony whereof I hereto. aihxed my` signature on this 18th fday of September,

. sHoNNARn.

initted to the door-opening engine 22 in any i well known manner. through the pipe r.112, this pressure is communicated ythrough the branch pipe 4l to the interior of the casting 34, where it causes the ball38 to `assume the position shown in Figure .3, pressing the tail piece 43 'to the left and causing the right hand extremity of the pivoted abutment25 to be depressed.

to move toward .the left in Figurel to open the door.

This n removes -this Vabutl Y ment from the path-ot movement of the.r abutment 24,' andL permitsthe sliding doors'` vWhile I have described myinvention here.` in as applied to elevator doors, it is to be understood that my invention applies to the a' .l operation of doors whether--usedin -connec.

tion with elevators or otherwise.-

Various changes may be' made in my improvement without departing troni theY scope i. of my invention, which is not limited to the .v

- details herein shownand described..

. .85 i' Ll. The combination according to claim l, .wherein said power operated abut-nient'coin-nV 

